Light source module for a light fixture

Abstract

A method for generating an air stream for cooling a light source, and a light source module for a light fixture with a blower for cooling the light source and the light source base. To achieve highly effective cooling of a lamp in a light fixture or a projector at least one forced air stream is generated by a blower system which blower system can be placed at a distance from the light source module and can be connected from the blower through a tube to a duct which directs an air stream towards the light source. By using a tube for the connection between the blowing unit and the actual place where air stream is to be used for cooling, it is possible to operate the blower in a place where the suction inlet for air into the blowing unit is a relatively cool place.

1. A light source module for a light fixture, comprising:
 a light source base, 
 a light source connected to the light source base, 
 cooling means for cooling the light source and the light source base, 
 a dichroic reflector, 
 at least one heat sink which surrounds the dichroic reflector and is formed of a number of dishes with air gaps between the dishes that are directed essentially perpendicular to a center axis of the light source module and with an air gap between the heat sink and the dichroic reflector, 
 wherein the cooling means comprises a blower system for generating at least one forced air stream, the blower system being located at a distance from the light source, reflector and at least one heat sink and being connected thereto through at least one tube which ends in ducts that direct the at least one forced air stream in a direction towards at least the light source; 
 wherein the ducts that direct the at least one forced air stream towards the light source direct the air stream toward a top electrical connection of the light source; and 
 wherein at least two oppositely directed forced airstreams are directed toward the light source base, and wherein at least two oppositely directed forced air streams are directed toward the light source electric top connection. 
 
     
     
       2. A light source module A light source module for a light fixture, comprising:
 a light source base, 
 a light source connected to the light source base, 
 cooling means for cooling the light source and the light source base, 
 a dichroic reflector, 
 at least one heat sink which surrounds the dichroic reflector and is formed of a number of dishes with air gaps between the dishes that are directed essentially perpendicular to a center axis of the light source module and with an air gap between the heat sink and the dichroic reflector, 
 wherein the cooling means comprises a blower system for generating at least one forced air stream, the blower system being located at a distance from the light source, reflector and at least one heat sink and being connected thereto through at least one tube which ends in ducts that direct the at least one forced air stream in a direction towards at least the light source; 
 wherein the ducts that direct the at least one forced air stream towards the light source direct the air stream toward a top electrical connection of the light source; 
 wherein the ducts that also direct at least one forced air stream towards the light source base and 
 wherein the light source base is placed in a cavity into which open at least two oppositely directed ducts for forced air, and wherein said cavity has an outlet connected towards the interior of the reflector and towards the air gap between the dichroic reflector and the heat sink. 
 
     
     
       3. A light source module according to  claim 2 , further comprising at least one heat filter in a light path from the light source, which heat filter reflects infrared light towards the heat sink. 
     
     
       4. A light source module according to  claim 2 , wherein the air gaps between the dishes forming the heat sink form a light trap for collecting infrared radiation. 
     
     
       5. A light source module according to  claim 2 , wherein the ducts have an essentially conical shape for increasing the velocity of the air stream leaving the ducts. 
     
     
       6. Method for cooling a light source module with air streams, the light source module comprising a light source base, a light source connected to the light source base, cooling means for cooling the light source and the light source base, a dichroic reflector, at least one heat sink which surrounds the dichroic reflector and is formed of a number of dishes with air gaps between the dishes that are directed essentially perpendicular to a center axis of the light source module and with an air gap between the heat sink and the dichroic reflector, comprising the steps of:
 generating an inlet forced air stream by a blower of the cooling means at a distance from the light source, reflector and at least one heat sink, 
 directing said inlet forced air stream through at least one tube which ends in ducts that directed air therefrom in a direction towards at least the light source; 
 wherein oppositely directed air streams are directed toward an electrical connection of the light source so as to generate a turbulent air flow around the electric connection of the light source in said directing step. 
 
     
     
       7. Method for cooling a light source module by an air stream according to  claim 6 , wherein at least two blowing means generate air streams, wherein the speed of the at least two blowing means are adjusted independently, and wherein the at least two blowing means are adjusted to operate at different speed at least during some time periods.